Ingot and bar shears



0ct.`27,19?5.- i 1,559,083

A. FRIEDERICI INGOT AND BAR SHEARS Filed March 25, 1925 having the novel design,

Patented ct. 27, 1925.-

- UNITED STATES 1,559,083- PATEISJT- oFFlcE.

f AUGUs'r FBIEDERI'GI, 'or DUSSELDORF, GERMANY, AssIGNoR 'ro MAX'FRIEDEBIGI,

or sTEUBENvILLnL omo. v l

maar AND BAB sums.

Abpucation med March 25, 1925. serial No. 18,222.

To @ZZ whom it may concern:

-Be it known ythat I, AUGUST FRIEDERICI, a citizen of the Republic of Germany, and vresident of Dusseldorf, Germany, have'invented certain new and useful Improvements in Ingot and Bar Shears, of which the following is a specification.

This invention'r'elates to shears and While vnot limited thereto, relates more particularly to billet and bar shears, and has for one of its objects' the provision of shears of this class 'having a pair of blades or jaws,l lower one of which is adapted to'move upwardly in the cutting operation. l"

Another object is to provide an improved form of shear of this class in which the overlap of the shear blades will be automatically adjusted in accordance with the size of the Awork-piece being sheared.

A further object is to provide a shear `of the class described, having its jaws open on three sides, so as to facilitate the handling of the sheared metal without subjecting the shear frame to any tensile or traction ef'- forts in a vertical direction.

A still further object is to provide a shear construction, and

combination of parts hereinafter described and illustrated in the accompanying 'drawingsi hollow construction In=the drawings- Figure l is a sectional side elevation of a shear embodyin my invention. Y.

Figure 2 is a similar elevation of a slightly modified form of shear.

Referring more particularly to the 'draW- ings, the letter b designates the fixed frame of the shear, f and Z designate the shear levers, and p designates the main drive shaft which is mounted in fixed bearings (not shown) and carries a m'ain drive member p and a pinion o.

yl`he upper portion of theframe b is of toprovide 4a guide for the reciprocating upper blade carrier h. The carrier` h is adapted to be reciprocated in the guide by the oating 'lever f,vwh1ch has its forward end projecting through'an opening in the guide and into a slot in the blade carrier h where it is pivotally connected at g, to a pressure bleek g secured in the blade 'holder Ft. A blade i is secured to the lower end of the holder it. y

The lever f has its -rear end pivotally secured te the upper end ofthe rack d whie theI l1 will be and,

is meshed" with the pinion 0 ont-he drive shaft p. The rack d isguided by guide rollers w and m, mounted in a framew which is pivotally mounted on the shaft p. The frame b has a depression below the lower blade in which is mounted a spring o and block .0, which block serves as a rest for the lower blade or carrier lever Z. The leverZ carries the lower blade n, and moves it up a ainst thematerial to be cut.

The evers f and Z are connected together adjacent their forward ends Vby a link m which is pivotally connected at la and lo to the respective levers.

- In Figure 2 the drive member p is mounted on a shaft 2 which also carries a sprocket c which sprocket is connected to a second sprocket c2 ,on the shaft p by a chain e. The

the rack @Z and pinion c ofthe construction ure 2 the lever f is secured to the chain e.. In operation the work-piece a is moved onto the vwork supporting portion b2 of the fixed frame I), and the drive vmember is then rotated in the direction of the arrow, thus rotating the shaft p and pinion 0, and moving the rack d vertically. The vertical movement of the rack d 'will lift the rear end of the shear lever f and cause it to act as al double arm lever with a fulcrum at 7c. The movement-of the lever f about the fulcrum 7:' will move the upper blade i down onto the work-piece at which time its downward movement will be arrested and the fulcrum point of the lever f will change vfrom the point la to point g. Continued upward movement of the rack d will cause the lever f to move about the fulcrum point g and thereby lift the lower shear lever Z by means of the linkconnection m, and causing the lever Z to rotate about the iXed shaft p until the blade n, on the forward end of the lever Z cuts through the work-piece a.

As will be readily understood from the drawings, :thelever Z carrying the lower lblade 'n has a smaller leverage than the lever f car ing the top blade i when the fulcrum is a ut the point and the thicker the work-piece the hg er the fulcrum point gY will be, an the greater the average' of the lever f. It will also be understood that the greater the leverage of le ver f, the greater theoverlap of the blades therefora'the overlap ot the chain' e and sprocket o2 being substituted for lUO blades will vary proportionately with the thickness of the work-pieces.

After the work-piece has been sheared, the drive member p is rotated in the reverse direction to return the parts to normal position, or if desired suitable springs, cylinders, counterweights, or the like may be used to return thev parts to normal position, as is well known in-the art.

AThe operation of the shear-.of Figure 2 -is the same as described above, except that the chain. e moves the lever f instead of the rack d.

Whenrit is notdesired to use the shears,

blade z' upwardly within the frame.

Ato

' thereby,

'its rear 5.0 end of said rack, whereby an upward move- While ll have shown and described spe cie embodiments of m invention, it will be understood that l do not wish to be limited thereto, since various modications may be made without de arting from the scope of my invention as eined in lthe appended claims.

1.' In an upcut ingot and bar shear, stationary work support, upper and lower shear levers, blades secured to the forward ends of said levers, said upper lever being pivotally connected to said upper blade, a link connecting each of said levers adjacent their forward ends, a power shaft, a pinion on said/shaft, and aurack in mesh with said pinion and movable substantially vertically said .lower shear lever beingv materiall shorter than said upper shear lever and aving its rear end pivotally connected to said power shaft, said upper'lever having end pivotally connected to the upper ment ofsaid rack'will first-rock said upper lever about its `connection with said linkso as te force its'v forward end', downwardly until the up erblade engages the material tobe sheare and continuedupward move-` ment of said rack will cause said upper lever to fulerum at its p1votal connection with said upper blade and to lift said link connection and saidw lower lever so as to force said lower lever to shear the material being sheared.

2. An ingot and bar shear of-the upcut type comprisinga stationary work support, upper and lower shear levers, upper and lower shear blades secured to the forward ends of said levers, said upper lever being pivotally connected to said upper blade, a link connecting each of said levers adjacent their forward ends, said lower shear lever being materially shorter than said upper/y shear lever and having its rear end mounted for pivotal movement about a fixed pivot, means for moving the rear end of said upper lever upwardly whereby at the start of said upward move be rocked aboutits connection with said link so as to force its forward end downwardly until the upper blade engages the material to be cut, and continued upward movement of the rear end of said upper lever will cause said upper lever to fulcrum at its pivotal connection with said upper blade. and to lift'said link connection and said lower lever to shear the material being cut.

43. An ingot and bar shear of the, upcut type comprising a stationary work support,

upper and lower spaced shear levers, an upper shear blade pivotally connected to the forward end of said upper shear lever, a lower shear blade rigidly connected to said lower shear lever, a link extending between and pivotally connected to each ofsaid shear levers adjacent their forward ends, said lower shear lever having its rear end mounted for pivotal movement about a xed pivot, and means for moving the rear end of said upper shear lever upwardly whereby at the vstart of said upward movement said upper lever will be rocked ,about its connection with said link so as to force its forward end ent said upper lever will downwardly until the upper blade engages In'testimony whereof I have hereunto set my hand.

l AUGUST FRIEDERICI. 

